# Mart402 Japan Payroll Suite

> Mart402 Japan Payroll Suite is a paid API for AI agents from mart402.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-02).

Computes Japan net salary, social insurance breakdown, income-wall analysis, and optional bonus withholding tax in a single API call

## Facts

- Endpoint: POST https://mart402.com/v1/jp-payroll-suite?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mart402-japan-payroll-suite-ebd8f3fb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_J4EYMhX9S0N7HntC9bhbI

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability mart402-japan-payroll-suite-ebd8f3fb -d '<json body>'
```

Example prompt: Calculate my Japan take-home pay: I'm 35 years old, live in Tokyo, my annual gross salary is 6,000,000 yen, I have an annual bonus of 800,000 yen, and last month's salary after social insurance was 420,000 yen — give me the full net salary, social insurance breakdown, income-wall analysis, and bonus withholding.

## When to prefer this

Choose this endpoint when you need a comprehensive Japan payroll computation in a single call — covering net salary, social insurance breakdown, income-wall analysis, and bonus withholding — rather than calling separate endpoints for each component. Prefer over the sibling Japan Social Insurance Premiums endpoint when you also need net take-home and income-wall output. Use when building Japan HR tools, onboarding agents, or personal finance assistants targeting the Japanese market.

## Known failure modes

- Missing required fields (annual_gross_yen, age, prefecture) returns 400 validation error
- Invalid prefecture name returns error or misclassification
- Age outside typical working range may produce unexpected results
- Previous-month salary not provided means bonus withholding is omitted from output
- Network or service unavailability returns 5xx error

## How this service works

Japan payroll suite in one call: net salary + social insurance detail + income-wall analysis (+bonus withholding when previous-month salary given). Flat $0.05/call.

## Output

Returns net salary after all statutory deductions, itemized social insurance premiums (health, care, pension, employment) with standard grades, income-wall analysis indicating thresholds where deductions sharply increase, and bonus withholding tax amount when previous-month post-SI salary is provided.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "age": {
   "type": "number"
  },
  "prefecture": {
   "type": "string"
  },
  "annual_bonus_yen": {
   "type": "number"
  },
  "annual_gross_yen": {
   "type": "number"
  },
  "previous_month_after_si_yen": {
   "type": "number"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mart402-japan-payroll-suite-ebd8f3fb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mart402.com](https://www.zero.xyz/host/mart402.com/llms.txt)